Hi Hope this helps, i have suffered for years with the same problem as has my dad(in his 70's) he bought L'oreal
Elvive antidandruff intensive shampoo treatment. and within one wash he was itch free! its in a dark blue bottle with white and orange writing on it. My dad said to me to try it, it wasnt expensive �3.00 ish a bottle, and i havent had a bit of itch either! so i am well impressed with this product. so i would ssay give it a go.
Hope this helps
Regards alinic.